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    METHODS OF MAKING CEMENTED CARBIDE INSERTS FOR EARTH-BORING BITS
    61.
    发明申请
    METHODS OF MAKING CEMENTED CARBIDE INSERTS FOR EARTH-BORING BITS 审中-公开
    制造用于地球钻头的碳化硅夹块的方法

    公开(公告)号：US20090180915A1

    公开(公告)日：2009-07-16

    申请号：US12397597

    申请日：2009-03-04

    Applicant: Prakash K. Mirchandani ,  Alfred J. Mosco

    Inventor： Prakash K. Mirchandani ,  Alfred J. Mosco

    IPC: B22F7/02

    CPC classification number: B22F7/06 ,  B22F2005/001 ,  B22F2998/00 ,  E21B10/52 ,  C22C29/005 ,  C22C29/067

    Abstract: This invention relates to cuffing inserts for earth boring bits comprising a cutting zone, wherein the cutting zone comprises first cemented hard particles and a body zone, wherein the body zone comprises second cemented hard particles. The first cemented hard particles may differ in at least one property from the second cemented hard particles. As used herein, the term cemented hard particles means a material comprising hard particles in a binder. The hard particles may be at least one of a carbide, a nitride, a boride, a silicide, an oxide, and solid solutions thereof and the binder may be at least one metal selected from cobalt, nickel, iron and alloys of cobalt, nickel or iron.

    Abstract translation: 本发明涉及用于包括切割区域的钻孔钻头的滚筒镶嵌件，其中切割区域包括第一粘合硬质颗粒和主体区域，其中主体区域包括第二粘结硬质颗粒。 至少一个性质的第一个胶结硬质颗粒可能与第二个胶结硬质颗粒不同。 如本文所使用的，术语胶结硬颗粒是指包含粘合剂中的硬颗粒的材料。 硬颗粒可以是碳化物，氮化物，硼化物，硅化物，氧化物和固溶体中的至少一种，并且粘合剂可以是选自钴，镍，铁和钴，镍的合金中的至少一种金属 或铁。

    Hybrid cemented carbide composites
    63.
    发明授权
    Hybrid cemented carbide composites 有权
    混合硬质合金复合材料

    公开(公告)号：US07384443B2

    公开(公告)日：2008-06-10

    申请号：US10735379

    申请日：2003-12-12

    Applicant: Prakash K. Mirchandani

    Inventor： Prakash K. Mirchandani

    IPC: C22C29/06

    CPC classification number: C22C1/051 ,  B22F2999/00 ,  C22C29/06 ,  B22F1/0003 ,  B22F1/0096

    Abstract: Embodiments of the present invention include hybrid composite materials comprising a cemented carbide dispersed phase and a cemented carbide continuous phase. The contiguity ratio of the dispersed phase of embodiments may be less than or equal to 0.48. The hybrid composite material may have a hardness of the dispersed phase that is greater than the hardness of the continuous phase. For example, in certain embodiments of the hybrid composite material, the hardness of the dispersed phase is greater than or equal to 88 HRA and less than or equal to 95 HRA and the hardness of the continuous phase is greater than or equal to 78 and less than or equal to 91 HRA.Additional embodiments may include hybrid composite materials comprising a first cemented carbide dispersed phase wherein the volume fraction of the dispersed phase is less than 50 volume percent and a second cemented carbide continuous phase, wherein the contiguity ratio of the dispersed phase is less than or equal to 1.5 times the volume fraction of the dispersed phase in the composite material.The present invention also includes a method of making a hybrid cemented carbide composite by blending partially and/or fully sintered granules of the dispersed cemented carbide grade with “green” and/or unsintered granules of the continuous cemented carbide grade to provide a blend. The blend may then be consolidated to form a compact. Finally, the compact may be sintered to form a hybrid cemented carbide.

    Abstract translation: 本发明的实施方案包括包含硬质合金分散相和硬质合金连续相的混合复合材料。 实施例的分散相的邻接比可以小于或等于0.48。 混合复合材料可以具有大于连续相硬度的分散相的硬度。 例如，在混合复合材料的某些实施方案中，分散相的硬度大于或等于88HRA且小于或等于95HRA，并且连续相的硬度大于或等于78％ 不超过91 HRA。 另外的实施方案可以包括混合复合材料，其包括第一硬质合金分散相，其中分散相的体积分数小于50体积％，第二硬质合金连续相，其中分散相的邻接比小于或等于 复合材料中分散相的体积分数的1.5倍。 本发明还包括通过将分散的硬质合金级分的部分和/或完全烧结的颗粒与连续硬质合金等级的“绿色”和/或未烧结颗粒混合以制备混合硬质合金复合材料以提供混合物的方法。 然后可以将共混物固结以形成紧凑体。 最后，可以将压块烧结以形成混合硬质合金。

    Multiple grade cemented carbide articles and a method of making the same
    64.
    发明授权
    Multiple grade cemented carbide articles and a method of making the same 失效
    多级硬质合金制品及其制造方法

    公开(公告)号：US5543235A

    公开(公告)日：1996-08-06

    申请号：US233388

    申请日：1994-04-26

    Applicant: Prakash K. Mirchandani ,  Robert E. Thomas ,  Mark Cippel

    Inventor： Prakash K. Mirchandani ,  Robert E. Thomas ,  Mark Cippel

    IPC: B22F7/06 ,  B22F3/12

    CPC classification number: B22F7/06 ,  Y10T428/12021 ,  Y10T428/12049 ,  Y10T428/12056 ,  Y10T428/12063 ,  Y10T428/12097

    Abstract: The present invention provides multiple grade, composite cemented carbide articles and a method of making such articles. The cemented carbide articles comprise carbides of different grades (or different compositions and/or microstructures) and, therefore, correspondingly different properties at different locations in the same article. The method of the present invention comprises filling different areas or portions of a die with metallurgical powders having different compositions and/or microstructures. The powder is then compressed as a single compact in the die cavity. The compressed compact is subsequently sintered to produce a multigrade cemented carbide article having composition and/or microstructural variations within the volume of the article.

    Abstract translation: 本发明提供多级复合硬质合金制品及其制造方法。 硬质合金制品包括不同等级（或不同的组成和/或微观结构）的碳化物，因此在相同制品中的不同位置处相应地具有不同的性质。 本发明的方法包括用具有不同组成和/或微结构的冶金粉末填充模具的不同区域或部分。 然后将粉末作为单个压块压缩在模腔中。 压缩的压块随后被烧结以产生在制品的体积内具有组成和/或微结构变化的多层硬质合金制品。

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